ZHU De-qing
,
CHUN Tie-jun
,
PAN Jian
,
HE Zhen
钢铁研究学报(英文版)
Red mud is the waste generated during aluminum production from bauxite, containing lots of iron and other valuable metals. In order to recover iron from red mud, the technology of adding sodium carbonate—reduction roasting—magnetic separation to treat high-iron red mud was developed. The effects of sodium carbonate dosage, reduction temperature and reduction time on the qualities of final product and the phase transformations in reduction process were discussed in detail. The results showed that the final product (mass percent), assaying Fe of 90.87% and Al2O3 of 0.95% and metallization degree of 94.28% was obtained at an overall iron recovery of 95.76% under the following conditions of adding 8% sodium carbonate, reduction roasting at 1050 ℃ for 80 min and finally magnetic separation of the reduced pellets by grinding up to 90% passing 0.074 mm at magnetic field intensity of 0.08 T. The XRD (X-ray diffraction) results indicated that the iron oxides were transformed into metallic iron. Most of aluminum mineral and silica mineral reacted with sodium carbonate during the reduction roasting and formed nonmagnetic materials.
关键词:
red mud
,
sodium sulfate
,
reduction roasting
,
magnetic separation
,
iron recovery
王志
,
韩敏芳
,
张以河
,
周风山
硅酸盐通报
利用二氧化碳对具有强碱性的拜耳法赤泥进行湿法碳化脱碱实验,研究了在CO2气流量为0.3 L/min条件下,液固比、反应温度、反应时间、CO2压力对拜耳法赤泥脱碱效果的影响并确定了适宜的脱碱条件.研究表明,在反应温度50℃,液固比为7,CO2压力为4 MPa,反应时间2h条件下,拜耳法赤泥的脱碱率达到50％以上.脱碱后赤泥碱含量大幅降低,有助于减轻对土壤及地下水源的危害.
关键词:
赤泥
,
脱碱
,
碳化
,
二氧化碳
罗中秋
,
司常钧
,
樊斌
,
周新涛
硅酸盐通报
本文以拜耳法赤泥固化干堆为背景,研究了低温陶瓷胶凝材料对赤泥固化效果的影响.结果表明,在浓度为60％的浆体中加入胶凝材料可显著提高材料土工力学性能.同时XRD、SEM分析表明,低温陶瓷胶凝材料中活性硅酸盐矿物在赤泥游离碱激发作用下,反应生成水化铝硅酸盐和水化硅酸盐,这些水化产物填充于赤泥颗粒间,使颗粒胶结连接成具有一定承载力的复合材料,实现了尾矿的安全堆存.
关键词:
赤泥
,
低温陶瓷胶凝材料
,
固化
